Kannapolis, the Sox Low-A affiliate, put up a chubby 5.12 ERA in 2007. In 2008, it dropped more than a full point to 4.08. And here in 2009, it dropped 80 more points to 3.24, 2nd best in the South Atlantic League by just .01. They were also 2nd in strikeouts, 2nd in WHIP, and led the league with 15 shutouts. Not surprisingly they finished the season at 82-57, best record in the 16-team league, despite being below the median in most offensive categories. And the pitching staff that achieved this was filled mostly with players drafted or signed since the 2008 June draft, not much more than a year ago. …